问题 解答题

已知:y1=x+3,y2=-x+2,求满足下列条件时x的取值范围:

(1)y1<y2                      

(2)2y1-y2≤4.

答案

(1)∵y1=x+3,y2=-x+2,

∴x+3<-x+2,解得x<-

1
2

(2)∵y1=x+3,y2=-x+2,2y1-y2≤4,

∴2(x+3)-(-x+2)≤4,解得x≤0.

单项选择题
单项选择题